I recently moved my Itunes music library to an external hard drive connected to my Airport Extreme. Ever since I did I have been getting an error when I try to sync. Itunes basically says syncing contacts, calendars, bookmarks, mail accounts, generally in the middle of syncing the music, videos, podcasts, etc I get the message below. The sync stops until I click ok and then the sync finishes. Everything appears to sync ok. But the message is annoying. And I assume something is going wrong. Perhaps the notes and sms are getting backed up? Has anyone seen this or have any ideas?